Mammals nocturnal

Masked Shrew

Sorex cinereus

The Masked Shrew is a microscopic marvel of the forest floor, a tiny predator that lives life at a relentless pace. As North America's most widely distributed shrew, this elusive neighbor is likely hunting in your leaf litter right now.

0 Sightings

0 Habitats

Quick Identification

straighten

Size

3.5 to 4.3 inches (90-110 mm) in length; 0.07 to 0.18 ounces (2-5 grams)

palette

Colors

Brownish-gray upper body with a lighter, silvery-gray or white underbelly and throat; tail is dark on top and light underneath.

visibility

Key Features

Extremely long, flexible, and pointed snout
Long, slender tail accounting for nearly 40% of total body length
Tiny, black, bead-like eyes and ears almost entirely hidden by fur
Delicate, five-toed feet that leave minuscule tracks

When You’ll See Them

schedule

Activity pattern nocturnal

brightness_5

Peak hours 9 PM - 4 AM, though active in short 15-30 minute bursts throughout the day.

calendar_month

Season Year-round

restaurant

Diet Primarily insectivorous, feeding on a wide variety of beetles, ants, moth larvae, and spiders. They also consume earthworms and will occasionally scavenge on carrion or small vertebrates.

park

Habitat Highly adaptable but prefers moist environments like thick leaf litter in forests, riverbanks, damp meadows, and suburban garden edges.

bar_chart
Loading activity data...

Behavior

The Masked Shrew is a tiny powerhouse of energy, possessing one of the highest metabolic rates of any mammal. Because of this, it lives a life of frantic, near-constant motion, forced to eat at least its own body weight in food every 24 hours just to avoid starvation. It rarely sleeps for long periods, instead alternating between short bursts of intense foraging and brief naps throughout the day and night.

Solitary and fiercely territorial, these shrews navigate their world primarily through smell and touch using their sensitive whiskers, as their eyesight is quite poor. While they do not hibernate and remain active even under the snow in winter, they are rarely seen by people because they spend the majority of their time under leaf litter, in fallen logs, or within the abandoned tunnels of meadow voles. They are vocal creatures, often emitting high-pitched twitters and squeaks while exploring.

photo_camera EverydayEarth exclusive

Camera Tips

Capturing the Masked Shrew on a trail camera is the ultimate challenge for backyard naturalists due to their tiny size and lightning-fast movements. To succeed, you must set your camera at 'ground zero.' Place the unit directly on the soil or on a low-profile mount just 2-3 inches off the ground. If your camera has a focal range limit, ensure it is positioned exactly at the distance where it can achieve a sharp focus on a small object—usually about 2 to 3 feet away. Using a camera with a 'macro' lens or a high-resolution sensor is a major advantage here.

Because shrews are so fast, they often appear as a blur or may trigger the camera too late, leaving you with a photo of a disappearing tail. To solve this, create a 'stopping point' using bait. A small smear of peanut butter, a few dried mealworms, or a teaspoon of wet cat food placed on a flat rock will encourage the shrew to pause for a few seconds. Place the bait inside a small, hollow log or a section of PVC pipe to create a 'natural' frame that directs the animal's movement toward your lens.

Camera settings are critical for these hyperactive mammals. Set your trigger speed to the fastest possible setting (0.2 seconds or less is ideal) and use the 'Burst Mode' to take 3-5 photos per trigger. If you prefer video, keep the clips short (5-10 seconds) to save battery, as the shrew will likely move in and out of the frame quickly. Since they are most active in the damp hours of the night, ensure your infrared flash is clean and unobstructed by tall grass, which can cause 'white-out' in your night shots.

Similar Species

Species that look similar or are commonly confused with Masked Shrew.

Pygmy Shrew

Even smaller than the Masked Shrew, the Pygmy Shrew has a significantly shorter tail relative to its body size.

Water Shrew

Much larger and darker in color, the Water Shrew has fringed fur on its hind feet for swimming.

Meadow Vole

Voles are much bulkier with blunt faces and small ears, and they primarily eat grass rather than insects.

Frequently Asked Questions

Masked Shrews are active throughout the entire 24-hour cycle to satisfy their high metabolism, but they show peak activity during the night, especially in the hours just after dusk and before dawn.

The best way to attract them is to maintain a 'wild' corner in your yard with thick leaf litter, mulch, and fallen logs. Providing a water source and avoiding pesticides ensures a healthy population of the insects they prey upon.

They are voracious insectivores. Their diet consists mostly of ants, beetles, spiders, crickets, and larvae. They are also known to eat earthworms and occasionally small snails.

Yes, they are incredibly common and widespread across northern North America, including suburban gardens. However, because they are so small and live under cover, they are rarely noticed by homeowners.

Unlike mice, which have large eyes, large ears, and blunt noses, Masked Shrews have a very long, pointed snout, tiny pin-head eyes, and ears that are almost completely hidden within their thick fur.

Record Masked Shrew at your habitat

Connect a camera to start building your own species record — AI identifies every visitor automatically.

Join free Identify a photo